Katzei, Lightfoot Guide

Commander ninjutsu {w}{u} ({w}{u}, Return an unblocked attacker you control to hand: Put this card
onto the battlefield from your hand or the command
zone tapped and attacking.)

Whenever Katzei, Lightfoot Guide deals combat
damage to a player, if you payed its Ninjutsu cost
this turn, you may put a commander you own
from your command zone onto the battlefield.
Partner